How to Backlit the speakers with LEDs?

How to backlit the speakers with LEDs, I have no knowledge about the electronics. I dont want to spoil my new speakers by opening its cases. The LEDs should be syncing with the sound, i mean it should light up on the beats.

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Philips have a product line called amBX, where you can buy speakers with lights mounted on top. Using the software that comes with the speaker/lights, you can have them change colour with the music, or analysing what is on the screen and creating an ambient colour to match (used for watching movies or gaming). It requires no electronic know-how whatsoever and comes with a complete set-up guide.